EverSSDI: blockchain-based framework for verification, authorisation and recovery of self-sovereign identity using smart contracts

Abstract

In the current identity management process, the problems such as increasing differentiation of digital identities, fragmentation and centralisation of identity information have been exposed. In this paper, a framework, named EverSSDI, using smart contracts in an Ethereum-based blockchain is constructed, which provides a unique identifier to normalise differentiated user identities. A fine-grained authorisation mechanism is designed based on the Hierarchical Deterministic protocol (HD protocol) to solve the fragmentation problem of identity information. Besides, a reliable information verification mechanism is elaborated to enhance the credibility of the digital information. In addition, two novel methods are proposed for identity recovery, one of which is based on Social Networking Services (SNS) authorisation and the other Ethereum Oracles. The final implementation and discussion show that the user has self-sovereign management authority, which enables the user to become the real dominant of his/her identity rather than only a prover of digital identity.